As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) 10 MINUTES AFTER TAKEOFF, RUDDER ISOLATE CAUTION LIGHT ILLUMINATED. PILOTS NOTICED A LOSS OF HYDRAULIC FLUID AND DECIDED TO RETURN TO AIRPORT. MAINTENANCE FOUND FLUID IN TAIL BUT COULD NOT ISOLATE WHERE FLUID CAME FROM. SUSPECT NR 1 RUDDER ACTUATOR MAY HAVE BYPASSED FLUID, UNIT WILL BE REMOVED AND SENT TO OVERHAUL FACILITY FOR INSPECTION.